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P2P-based Video on Demand (P2P VoD) systems can provide higher quality video services than P2P live systems. However, owing to the unavailability of open source codes, the characteristics of P2P VoD systems have not been fully explored. For this purpose, in this paper, the authors first implemented reverse engineering to the protocols of two most popular VoD systems used in China. Peers' watching behavior and network sharing were then studied through the measured buffer messages. Based on their study, they found that uploading-only peers were more than downloading peers, and smooth-watching peers were more than randomly-seeking peers in the current P2P VoD systems.
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